ISX Horsepower/Torque setting

[marek4792]

I run a 3.36 and I believe a couple other members here run 3.42/3.36 gears (which are nearly identical) of course with 13/18 speed manuals. We don't split the top gear to the high side when running 65 mph or less to keep the rpms up when cruising. It works out OK, but prepare a budget to eventually regear it for your purpose if you can't find a truck with the right rears.